[#221] feat(HomeService): 공연 및 홍보 조회 서비스 로직 최적화

src/main/java/com/beat/domain/performance/application/HomeService.java

@@ -0,0 +1,71 @@
+package com.beat.domain.performance.application;
+
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.List;
+
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import com.beat.domain.performance.application.dto.home.HomeFindAllResponse;
+import com.beat.domain.performance.application.dto.home.HomeFindRequest;
+import com.beat.domain.performance.application.dto.home.HomePerformanceDetail;
+import com.beat.domain.performance.application.dto.home.HomePromotionDetail;
+import com.beat.domain.performance.dao.PerformanceRepository;
+import com.beat.domain.performance.domain.Genre;
+import com.beat.domain.performance.domain.Performance;
+import com.beat.domain.promotion.domain.Promotion;
+import com.beat.domain.promotion.port.in.PromotionUseCase;
+import com.beat.domain.schedule.application.ScheduleService;
+
+import lombok.RequiredArgsConstructor;
+
+@Service
+@RequiredArgsConstructor
+public class HomeService {
+
+	private final ScheduleService scheduleService;
+	private final PromotionUseCase promotionUseCase;
+
+	private final PerformanceRepository performanceRepository;
+
+	@Transactional(readOnly = true)
+	public HomeFindAllResponse findHomePerformanceList(HomeFindRequest homeFindRequest) {
+
+		List<Performance> performances = findPerformancesByGenre(homeFindRequest);
+		List<HomePromotionDetail> promotions = findAllPromotionsSortedByCarouselNumber();
+
+		if (performances.isEmpty()) {
+			return HomeFindAllResponse.of(promotions, new ArrayList<>());
+		}
+
+		List<HomePerformanceDetail> sortedPerformances = performances.stream()
+			.map(performance -> {
+				int minDueDate = scheduleService.getMinDueDateForPerformance(performance.getId());
+				return HomePerformanceDetail.of(performance, minDueDate);
+			})
+			.sorted(Comparator.comparingInt(HomePerformanceDetail::dueDate)
+				.reversed()
+				.thenComparingInt(detail -> detail.dueDate() >= 0 ? -1 : 1))
+			.toList();
+
+		return HomeFindAllResponse.of(promotions, sortedPerformances);
+	}
+
+	private List<Performance> findPerformancesByGenre(HomeFindRequest homeFindRequest) {
+		Genre genre = homeFindRequest.genre();
+
+		if (genre != null) {
+			return performanceRepository.findByGenre(genre);
+		}
+
+		return performanceRepository.findAll();
+	}
+
+	private List<HomePromotionDetail> findAllPromotionsSortedByCarouselNumber() {
+		return promotionUseCase.findAllPromotions().stream()
+			.sorted(Comparator.comparing(Promotion::getCarouselNumber, Comparator.comparingInt(Enum::ordinal)))
+			.map(HomePromotionDetail::from)
+			.toList();
+	}
+}